-- IMPORTANT: This is the ONLY place where schema changes should be made.
-- We do NOT support migrations. All schema changes MUST be in this file.
-- DO NOT make schema changes anywhere else in the codebase.

CREATE TABLE IF NOT EXISTS asns (
	asn INTEGER PRIMARY KEY,
	handle TEXT,
	description TEXT,
	-- WHOIS parsed fields
	as_name TEXT,
	org_name TEXT,
	org_id TEXT,
	address TEXT,                -- full address (may be multi-line)
	country_code TEXT,
	abuse_email TEXT,
	abuse_phone TEXT,
	tech_email TEXT,
	tech_phone TEXT,
	rir TEXT,                    -- ARIN, RIPE, APNIC, LACNIC, AFRINIC
	rir_registration_date DATETIME,
	rir_last_modified DATETIME,
	-- Raw WHOIS response
	whois_raw TEXT,              -- complete WHOIS response text
	-- Timestamps
	first_seen DATETIME NOT NULL,
	last_seen DATETIME NOT NULL,
	whois_updated_at DATETIME    -- when we last fetched WHOIS data
);

-- IPv4 prefixes table. Every read and write finds a row by its prefix, so the
-- rows are stored by prefix (WITHOUT ROWID) and need no index of their own.
CREATE TABLE IF NOT EXISTS prefixes_v4 (
	prefix TEXT PRIMARY KEY,
	first_seen DATETIME NOT NULL
) WITHOUT ROWID;

-- IPv6 prefixes table, stored as prefixes_v4 is.
CREATE TABLE IF NOT EXISTS prefixes_v6 (
	prefix TEXT PRIMARY KEY,
	first_seen DATETIME NOT NULL
) WITHOUT ROWID;

CREATE TABLE IF NOT EXISTS announcements (
	id TEXT PRIMARY KEY,
	prefix_id TEXT NOT NULL,
	peer_asn INTEGER NOT NULL,
	origin_asn INTEGER NOT NULL,
	path TEXT NOT NULL,
	next_hop TEXT,
	timestamp DATETIME NOT NULL,
	is_withdrawal BOOLEAN NOT NULL DEFAULT 0,
	FOREIGN KEY (peer_asn) REFERENCES asns(asn),
	FOREIGN KEY (origin_asn) REFERENCES asns(asn)
);

CREATE TABLE IF NOT EXISTS peerings (
	id TEXT PRIMARY KEY,
	as_a INTEGER NOT NULL,
	as_b INTEGER NOT NULL,
	first_seen DATETIME NOT NULL,
	last_seen DATETIME NOT NULL,
	UNIQUE(as_a, as_b)
);

-- BGP peers that send us messages
CREATE TABLE IF NOT EXISTS bgp_peers (
	id TEXT PRIMARY KEY,
	peer_ip TEXT UNIQUE NOT NULL,
	peer_asn INTEGER NOT NULL,
	first_seen DATETIME NOT NULL,
	last_seen DATETIME NOT NULL,
	last_message_type TEXT
);

CREATE INDEX IF NOT EXISTS idx_announcements_timestamp ON announcements(timestamp);
CREATE INDEX IF NOT EXISTS idx_announcements_prefix_id ON announcements(prefix_id);
CREATE INDEX IF NOT EXISTS idx_announcements_peer_asn ON announcements(peer_asn);
CREATE INDEX IF NOT EXISTS idx_announcements_origin_asn ON announcements(origin_asn);
CREATE INDEX IF NOT EXISTS idx_peerings_as_a ON peerings(as_a);
CREATE INDEX IF NOT EXISTS idx_peerings_as_b ON peerings(as_b);
CREATE INDEX IF NOT EXISTS idx_peerings_lookup ON peerings(as_a, as_b);

-- Indexes for asns table
CREATE INDEX IF NOT EXISTS idx_asns_asn ON asns(asn);
CREATE INDEX IF NOT EXISTS idx_asns_whois_updated_at ON asns(whois_updated_at);
-- Finds the AS last seen most recently and the one last seen longest ago, for
-- the home page.
CREATE INDEX IF NOT EXISTS idx_asns_last_seen ON asns(last_seen);

-- Indexes for bgp_peers table
CREATE INDEX IF NOT EXISTS idx_bgp_peers_asn ON bgp_peers(peer_asn);
CREATE INDEX IF NOT EXISTS idx_bgp_peers_last_seen ON bgp_peers(last_seen);
CREATE INDEX IF NOT EXISTS idx_bgp_peers_ip ON bgp_peers(peer_ip);

-- The whole routing table, as internal/routetable keeps it in memory: one row
-- for each prefix and origin AS that some peer carries. Startup reads every
-- row, and the rows of the pairs that change are written back.
CREATE TABLE IF NOT EXISTS routes (
	prefix TEXT NOT NULL, -- in the text form Go's net/netip prints
	origin_asn INTEGER NOT NULL,
	-- The peers whose current route to the prefix has this origin AS: a set
	-- of their numbers in route_peers, as the bitset package's MarshalBinary
	-- writes it.
	peers BLOB NOT NULL,
	-- The newest of those routes and the one before it, the two kept in full.
	-- Each has its peer's number in route_peers, its AS path as a JSON array,
	-- and its time in seconds since 1970, UTC. A route that is not kept has
	-- NULL in its three columns.
	newest_peer INTEGER,
	newest_as_path TEXT,
	newest_time INTEGER,
	older_peer INTEGER,
	older_as_path TEXT,
	older_time INTEGER,
	PRIMARY KEY (prefix, origin_asn)
) WITHOUT ROWID;

-- The peers of the routes table, each with the number it has there.
CREATE TABLE IF NOT EXISTS route_peers (
	number INTEGER PRIMARY KEY,
	address TEXT NOT NULL UNIQUE
);